Lake Superior Fun Facts

• Size: 31,700 square miles
• Deepest spot: 1265 feet
• Shoreline length: 1,826 miles
• Watershed area: 49,300 square miles
• Volume: 3,000,000,000,000,000 gal
• Average outflow of water (1990-2007): 75,574 cubic feet per second
• Elevation: 600 feet above sea level
• Average water temperature (2003-2007): 45° F
• Average underwater visibility: 27 feet
• Vessels visiting Duluth/Superior port (2007): 1,231
• Number of fish species: 89 (31 native, 21 non-native)
• Water retention/replacement time: 191 years
• Tidal motion: About 1 inch
• Average number of foggy days in Duluth: 52
• Basin population: 425,548 U.S. 181,573 Canada
• Estimated tourists: over 3.5 million per year